Manipulating units for mass calculation
Manipulating units for mass calculation
(OP)
Using ProE 2001
We have a set of models where the units were initially set to mmNs. At first we didn't want to calculate the mass and the models were ignorant of the material, the same models could be used for many materials.
Recently we have modelled some production tools where the materials were known and we hit a problem. When we tried to do a mass calculation the density requested had units of tonnes per cubic mm and returned the mass in tonnes.
I know that if we had set the units to mmKs the mass and density would have required kilograms not tonnes but now I need to adjust the model and I have two options:
1. I adjust the units in the model but this throws the related drawings out by a factor of 1000 and so I need a solution for the drawings as well.
2. I create a relationship and a subsequent variable for mass in kg, calculating the value from the mass in tonnes, and display this variable value on the drawing.
The problem I have:
1. I don't know how to get around the problem with the drawing rescaling its dimensions.
2. I don't know how to reference a data analysis value in a relation and create a variable and I don't know how to reference relation variables in drawing tables.
Can anyone help with either issue?
Cheers.
We have a set of models where the units were initially set to mmNs. At first we didn't want to calculate the mass and the models were ignorant of the material, the same models could be used for many materials.
Recently we have modelled some production tools where the materials were known and we hit a problem. When we tried to do a mass calculation the density requested had units of tonnes per cubic mm and returned the mass in tonnes.
I know that if we had set the units to mmKs the mass and density would have required kilograms not tonnes but now I need to adjust the model and I have two options:
1. I adjust the units in the model but this throws the related drawings out by a factor of 1000 and so I need a solution for the drawings as well.
2. I create a relationship and a subsequent variable for mass in kg, calculating the value from the mass in tonnes, and display this variable value on the drawing.
The problem I have:
1. I don't know how to get around the problem with the drawing rescaling its dimensions.
2. I don't know how to reference a data analysis value in a relation and create a variable and I don't know how to reference relation variables in drawing tables.
Can anyone help with either issue?
Cheers.





RE: Manipulating units for mass calculation
Why not change the units in your parts to mm ,KG s (create a custom setting) and then reassign the materials (with density in your according units kg/mm^2) to your parts? This can be done yith a mapkey.
Forget the scaling and other tricks. Yes it can be done, buth those are IT tricks. We are mechanical engineers.
-Hora
RE: Manipulating units for mass calculation
The reason I'm getting dimensions changing by a factor of 1000 is because MKS is metres not millimetres, I hadn't realised this.
Seems a bit daft that you kg with m and tonne with mm but hey, I'll create my own custom units.
Cheers.
RE: Manipulating units for mass calculation
-Hora